i have been looking around and have come up with the idea of putting exhaust cutouts on my 4.0 tacoma, it is basically like a y pipe in a sense, here is the link to see what im talking about...http://www.thunderracing.com/catalog/?action=shop&sid=168&pcid=101... i was planning on leaving my factory muffler in to keep the truck quiet especially on road trips, but when im cruising around just uncap them and let it roar. I was going to place two of them on my truck, placing them right after my catalytic converters but before the point where the two pipes meet up to be one and exit the rear of the truck. This would create true duals when uncapped! Any input on what you think of this anywhere from sound to performance would be greatly appreciated!!!! Thanks alot

i have been looking around and have come up with the idea of putting exhaust cutouts on my 4.0 tacoma, it is basically like a y pipe in a sense, here is the link to see what im talking about...http://www.thunderracing.com/catalog/?action=shop&sid=168&pcid=101... i was planning on leaving my factory muffler in to keep the truck quiet especially on road trips, but when im cruising around just uncap them and let it roar. I was going to place two of them on my truck, placing them right after my catalytic converters but before the point where the two pipes meet up to be one and exit the rear of the truck. This would create true duals when uncapped! Any input on what you think of this anywhere from sound to performance would be greatly appreciated!!!! Thanks alot

there is a whole science to exhaust tuning
but the bottom line is really not much change in performance, just at different rpm
so if you get performance at higher rpm you loose it at the bottom end
that's why i say stuff a noiser muffler on it

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I actually dynoed an angine just for kicks with the whole exhaust disco'ed at the headers, and the engine LOST 10 h.p. accross the board.